It’s social application. It’s binary product. It might need more than 1 million push notification if it gets viral, otherwise it will be less than that. I just want to confirm, is it free for unlimited usage? If not then is there any pricing table?

I also have a large number of users in one project that I’m working for and I would like to know if its possible to send hundred thousands of push notifications with expo or if is better to use another solution.

If you plan on sending a million push notifications at once, currently it might be better to detach and send notifications through your own server. We’re working on increasing the peak capacity of our push services amongst many other projects but you’ll always inherently have more control over a server you run yourself.

I suspect you’ll see issues right now if you send 100k at once but things should be fine if you space out your requests and have retry policies. And also be sure to use the batched API (our Node and Python SDKs use it by default) and to remove tokens for which you get DeviceNotRegistered errors.

A couple days ago we also deployed a change to the Expo servers to fix an issue that could cause push notifications to time out if a couple thousand were received at once. We still recommend throttling the notifications and having retry logic (we could add this to the Node SDK perhaps) but push notification performance and reliability should be better now.